As a double major if you do reasonably well in only the second major will it affect your chances of getting into a good grad school?

I started out as an economics major after being pushed into it by my family. However, I never had much of an interest in this subject. I was going through a very rough time in the first two years and I never excelled much in economics and I did not care about what was happening to me. However, a math professor who is my current thesis supervisor encouraged me to look into the math department and that’s when I thought about finally majoring in a subject I actually cared about and doing something for myself. Thus, I ended up double majoring in mathematics and I started finally feeling somewhat invested into my own future. I have done quite well in my second major (mathematics) and I hope to do a master’s in either mathematics or statistics in France or Germany.

However, I am worried if I can even get into a good grad school as my grades in economics are not very good.

1. I have no idea how grad school admissions look into double majors. How will my case be considered if I want to do a master’s in mathematics? Will my performance in economics adversely affect my chances of getting into a good grad school?
2. Is it recommended that I retake some economics courses I haven’t done well in? I really don’t want to. I would prefer to use that time to study more mathematics and preparing for grad school which is a cumbersome process in itself and retaking would also mean more finances behind a subject I don’t care about. But if it comes down to that then I will have to give it a try.